tools/build: Add libmpc-dev to list of packages to install
tools/build: Add libmpc-dev to list of packages to install

I needed to install this to build GCC.

Signed-off-by: John Brooks <a51dda7c7ff50b61eaea0444371f4a6a9301e501@fastquake.com>

sp1187/libdragon,sp1187/libdragon,sp1187/libdragon,DragonMinded/libdragon,DragonMinded/libdragon,DragonMinded/libdragon